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Dr. Moira Smith (D-CAT)
Dr. Quentin BECHET (Veolia)
Using trees as
sensors to predict
sewer blockages
WE ARE HELPING GREATER WESTERN WATER TO
OPTIMISE THEIR SEWER MAINTENANCE PROGRAM
Western Network length (20/21)
1,563 km
Western blockage rate (20/21)
15.3 blockages / 100km / year
Maintenance rate (20/21)
~5% / year
IDEALLY WE WANT DIRECT TECHNIQUES
TO TARGET WHAT PIPES TO CLEAN
Smart sewer lid Kando sensors
Examples of sensor technologies trialled
at Greater Western Water Sensor-based
technologies have
great potential but are
still very expensive!
The entire network
cannot be equipped
with these sensors,
especially in Australia
where networks are
extensive!
THE TREES CAN BE USED
AS BLOCKAGE SENSORS
In Victoria, the large majority of
blockages are caused by tree
roots
D-CAT DEVELOPED AN ALGORITHM FOR TREE GROWTH
INITIALLY FOR THE FORESTRY INDUSTRY
For deforestation For monitoring planting, growth & regeneration
Change in
tree health
over time
Earlier satellite image Later satellite image
Area for
replanting
Tree
growth
evident
Segmented
region of
growth
Automatically
highlighted
Detected
deforestation,
Bolivia
More within months
GREEN: vegetation, e.g. forest areas
BLUE/BLACK: water bodies & bare soil
USING MULTISPECTRAL SATELLITE IMAGERY
TREE DETECTION AND INSIGHTS ARE POSSIBLE
STEP 1
SKYCAM BLOCKAGES CAN DETECT TREES
STEP 2: TIME SERIES OF SATELLITE IMAGES CAN BE USED TO
DETECT ABNORMAL TREE ABUNDANCE
No action required
Monitor
Anomalous Trees
WE SUCCESSFULLY TESTED SKYCAM BLOCKAGES
IN SUNBURY, VIC
CLEANING THE 5% MOST CRITICAL PIPES WOULD ALLOW
TO AVOID ~20% OF BLOCKAGES
Percentage of network inspected (%)
Percentage
of
blockages
avoided
(%)
SKYCAM BLOCKAGES DEMO
“TREE RISK” ON PIPES
SKYCAM BLOCKAGES DEMO
“TREE RISK” ON PIPES
SKYCAM BLOCKAGES DEMO
SATELLITE IMAGE PIXELS
SKYCAM BLOCKAGES DEMO
SATELLITE IMAGE PIXELS
SKYCAM BLOCKAGES DEMO
SATELLITE IMAGE PIXELS
CONCLUSIONS
& NEXT STEPS
Promising results
SkyCam Blockages was proven through multiple trials over years and different locations in
Victoria to reliably highlight anomalous trees near to sewer networks, providing utilities the
ability to optimise network inspections and cleaning.
Next steps
SkyCam Blockages will shortly (today!) go live at Greater Western Water.
Dr. Moira Smith (D-CAT)
moira.smith@d-cat.co.uk
Questions?
Contact us!
Dr. Quentin Bechet (Veolia)
quentin.bechet@veolia.com

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LOOKING AT THE RISK MAPPING & REPORTING OF NETWORK LEAKS USING REMOTE SENSING

  • 1. Dr. Moira Smith (D-CAT) Dr. Quentin BECHET (Veolia) Using trees as sensors to predict sewer blockages
  • 2. WE ARE HELPING GREATER WESTERN WATER TO OPTIMISE THEIR SEWER MAINTENANCE PROGRAM Western Network length (20/21) 1,563 km Western blockage rate (20/21) 15.3 blockages / 100km / year Maintenance rate (20/21) ~5% / year
  • 3. IDEALLY WE WANT DIRECT TECHNIQUES TO TARGET WHAT PIPES TO CLEAN Smart sewer lid Kando sensors Examples of sensor technologies trialled at Greater Western Water Sensor-based technologies have great potential but are still very expensive! The entire network cannot be equipped with these sensors, especially in Australia where networks are extensive!
  • 4. THE TREES CAN BE USED AS BLOCKAGE SENSORS In Victoria, the large majority of blockages are caused by tree roots
  • 5. D-CAT DEVELOPED AN ALGORITHM FOR TREE GROWTH INITIALLY FOR THE FORESTRY INDUSTRY For deforestation For monitoring planting, growth & regeneration Change in tree health over time Earlier satellite image Later satellite image Area for replanting Tree growth evident Segmented region of growth Automatically highlighted Detected deforestation, Bolivia More within months GREEN: vegetation, e.g. forest areas BLUE/BLACK: water bodies & bare soil
  • 6. USING MULTISPECTRAL SATELLITE IMAGERY TREE DETECTION AND INSIGHTS ARE POSSIBLE
  • 7. STEP 1 SKYCAM BLOCKAGES CAN DETECT TREES
  • 8. STEP 2: TIME SERIES OF SATELLITE IMAGES CAN BE USED TO DETECT ABNORMAL TREE ABUNDANCE No action required Monitor Anomalous Trees
  • 9. WE SUCCESSFULLY TESTED SKYCAM BLOCKAGES IN SUNBURY, VIC
  • 10. CLEANING THE 5% MOST CRITICAL PIPES WOULD ALLOW TO AVOID ~20% OF BLOCKAGES Percentage of network inspected (%) Percentage of blockages avoided (%)
  • 11. SKYCAM BLOCKAGES DEMO “TREE RISK” ON PIPES
  • 12. SKYCAM BLOCKAGES DEMO “TREE RISK” ON PIPES
  • 16. CONCLUSIONS & NEXT STEPS Promising results SkyCam Blockages was proven through multiple trials over years and different locations in Victoria to reliably highlight anomalous trees near to sewer networks, providing utilities the ability to optimise network inspections and cleaning. Next steps SkyCam Blockages will shortly (today!) go live at Greater Western Water.
  • 17. Dr. Moira Smith (D-CAT) moira.smith@d-cat.co.uk Questions? Contact us! Dr. Quentin Bechet (Veolia) quentin.bechet@veolia.com